Flask 未收到 SocketIO 消息

Question

我是 Flask 和 IO 的新手。 我正在嘗試為具有 RoS 的機器實現基本數據接收器。 我有一個 python 腳本將數據發送到在 Flask 上運行的 web 服務器。 問題是從未調用過 java-script 回調，因此奇怪的是，即使沒有錯誤，這些數字也從未添加到列表中。 相關部分是這樣的：

在 Python 網絡服務器中：

@socketio.on('connect', namespace='/test')
def test_connect():
    print("CALLED")

@socketio.on('disconnect', namespace='/test')
def test_disconnect():
    print('Client disconnected')

它應該發布一個由以下 Ros Callback function 定義的隨機數（每 0.5 秒調用一次）：

def forklift_callback(self, msg):
    #SOCKET TEST

    number = random.randint(1,101)
    print(number)
    socketio.emit('newnumber', {'number': number}, namespace='/test')

也許我定義它的方式很重要：

*import statements*
from std_msgs.msg import String, UInt32
from umd_msgs.msg import PCNotification, RoverStatus, Barcode


mod = Blueprint('api', __name__)
msg = String()
started = "robot started"

socketio = SocketIO(app)
... All functionality ...

if __name__ == '__main__':
    socketio.run(app)

它連接到 html 頁面，位於以下位置：

<html>
<head>
    <script src="//code.jquery.com/jquery-3.3.1.min.js"></script>
    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/socket.io/1.3.6/socket.io.min.js"></script>
<script>
        $(document).ready(function(){
            //connect to the socket server.
        console.log('http://' + document.domain + ':' + location.port + '/test')
            var socket = io.connect('http://' + document.domain + ':' + location.port + '/test');
            var numbers_received = [];

            //receive details from server
            socket.on('newnumber', function(msg) {
            console.log("Blank")
                console.log("Received number" + msg.number);
                //maintain a list of ten numbers
                if (numbers_received.length >= 10){
                    numbers_received.shift()
                }
                numbers_received.push(msg.number);
                numbers_string = '';
                for (var i = 0; i < numbers_received.length; i++){
                    numbers_string = numbers_string + '<p>' + numbers_received[i].toString() + '</p>';
                }
                $('#log').html(numbers_string);
            });

        });
</script>
    <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<div class="container">
  <div class="jumbotron">
    <h1>Asynchronous Flask Communication</h1>
    <p>Random numbers generated by the Flask server will appear below, asynchronously.</p>

  </div>
</div>

</div>

<div class="container" id="content">
    <div class="row">
        <p>Asynchronous page updates will appear here:</p>
        <h3>Number list:</h3>
        <div id="log">
        </div> <!-- /#log -->
    </div>
</div>

Answer 1

試試這樣的東西，也許它有幫助

您可以使用將運行 function 的線程來執行此操作

yourThread = Thread()
thread_stop_event = Event()

class someClass(Thread):
  def __init__(self):
    self.delay = 1
    super(someClass,self).__init__()

  def forklift_callback(self):
    while not thread_stop_event.isSet():           
      number = random.randint(1,101)
      print(number)
      socketio.emit('newnumber', {'number': number}, namespace='/test')
      sleep(self.delay)

  def run(self):
    self.forklift_callback()

@socketio.on('connect', namespace='/test')
def test_connect():
  print("CALLED")

  global yourThread
  if(not yourThread.isAlive()):
    yourThread = someClass()
    yourThread.start()

或者在客戶端連接您的服務器后運行它

@socketio.on('connect', namespace='/test')
def test_connect():
  //your function here
  print("CALLED")

Flask 未收到 SocketIO 消息

問題描述

1 個解決方案

解決方案1
0 2019-09-25 11:21:11

Flask 未收到 SocketIO 消息

問題描述

1 個解決方案

解決方案1 0 2019-09-25 11:21:11

解決方案1
0 2019-09-25 11:21:11